q 90 min means every one and a half hours.
If you are referring to taking medication every 12 hours, I would think "twice a day" or "bidaily" would be sufficient expressions in a medical setting. Some prescribers prefer to write q12h for "every twelve hours."
q stands for quaque, meaning every in Latin. qd is every day, q4h is every four hours, etc.
q2h means every 2 hours.Every 2 hours
The medical abbreviation for every four hours is q4h.q4h
Take 1 tab po q12 h
3/day or 3xdayThree times daily is abbreviated TID or t.i.d.
The medical abbreviation for six times per day is q6h, which stands for "every 6 hours." This term is commonly used in medical prescriptions to indicate the frequency of medication dosing.
every four hours
it means in medical terms, every three hours
it means in medical terms, every three hours
Fasting is the medical term for no food intake; this term is often used in the context of lab testing, with instructions to have, for instance, nothing but water for 12 hours before the test. NPO (nil per os) is the term meaning nothing by mouth -- not even water. These instructions may be given before surgery or certain kinds of diagnostic imaging.